Synthesis 2022; 54(24): 5423-5433
DOI: 10.1055/a-1912-1096
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Insights into the Reactivity of 2-Hydroxycyclobutanones with Thiols Corroborated by Quantum Chemical DFT Investigations and NMR and Raman Analysis

Stefania Porcu
a   Chemical and Geological Science Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
b   Physics Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
,
Maria Chiara Cabua
a   Chemical and Geological Science Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
,
Viktoria Velichko
a   Chemical and Geological Science Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
,
Jean-Pierre Baltaze
c   Université Paris-Saclay, Bât. 410 – SC – ICMMO, Rue du doyen Georges Poitou, 91405 Orsay Cedex, France
,
a   Chemical and Geological Science Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
c   Université Paris-Saclay, Bât. 410 – SC – ICMMO, Rue du doyen Georges Poitou, 91405 Orsay Cedex, France
,
Carlo Maria Carbonaro
b   Physics Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
,
Pier Carlo Ricci
b   Physics Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
,
a   Chemical and Geological Science Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
,
d   Department of Physical and Chemical Sciences, Università degli Studi dell’Aquila, via Vetoio, 67100 L’Aquila, Italy
,
a   Chemical and Geological Science Department, Cagliari State University, Block D, S.S. 554, 09042 Monserrato (Cagliari), Italy
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We gratefully acknowledge funding from the Fondazione di Sardegna (CUP F71I17000180002).


Abstract

A general strategy for the synthesis of 2-substituted cyclobutanone sulfides via a tandem Brønsted acid-catalyzed nucleophile addition/ring contraction/C3-C4 ring expansion reaction sequence has been exploited. The procedure led to a wide panel of four-membered cyclic ketones in good to excellent yields and with broad substrate scope. Mechanistic aspects and kinetic parameters were investigated by quantum chemical DFT calculations, allowing us to rationalize the different reactivity of 2-aryl- and 2-alkyl-substituted 2-hydroxycyclobutanones towards thiol nucleophiles in reactions mediated by sulfonic acids. NMR and in situ Raman techniques were employed to better understand the reaction kinetics and parameters that affect the desired outcome.

Supporting Information



Publikationsverlauf

Eingereicht: 30. Juni 2022

Angenommen nach Revision: 28. Juli 2022

Accepted Manuscript online:
28. Juli 2022

Artikel online veröffentlicht:
10. Oktober 2022

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